Only under certain conditions can the 20H principle have obvious effects. 1. The power plane shall be located inside the PCB, and the upper and lower layers adjacent to it shall be 0V planes, and the distance between the two 0V planes shall be at least 20
The difference between them is that the core is thinner, the pp sheets of one or two layers and five or six layers are thinner, and there is a core board between the core board and the core board without copper foil on both sides, so generally this kind o
The characteristics of the gold process: the copper on the circuit board is mainly copper, copper solder in the air is easy to be oxidized, which will cause the electrical conductivity is to eat tin bad or bad contact, reduce the performance of the circui
The function of PCB design discharge teeth: in surge testing or ESD testing, the two ends of the common-mode inductor will produce high voltage, there will be a flying arc, if the distance is close to the surrounding devices, it may cause damage to the su
Soft and hard combined board PCB design points: 1, flexible area line design requirements, 2, dimensional stability, 3, covering film window design, 4, rigid flexible transition zone design, 5, flexible zone design with air-gap requirements
Surface mount technology is very convenient in the manufacture of many PCBS. Reliable and fast professional tools handle installation to ensure that there is no room for human error while speeding up the process.
Common treatment methods are added sewing capacitor and bridge :1, sewing capacitor, 2, bridge, 3, multi-layer wiring, 4, lead bending less, the better, 5, the shorter the better, 6, lead layer alternating less, the better, 7, pay attention to parallel cr
There are the following factors affecting PCB welding quality: PCB diagram, circuit board quality, device quality, device pin oxidation degree, solder paste quality, solder paste printing quality, placement machine programming accuracy, placement machine
PCB design service process: 1. The customer provides schematic diagram to consult PCB design; 2. 2. Evaluate quotation according to schematic diagram and customer design requirements;3. The customer confirms the quotation, signs the contract and pays the
The following operations will be carried out in the maintenance technology: 1, inspection of components, 2, welding state analysis, 3, detection of components direction, 4, tool inspection of components, 5, power-on test
Because the wider the printed line is, the smaller the inductance is, the lead line from the pad to the hole should be widened as far as possible, and the width of the pad should be the same as far as possible. In this way, even the capacitance of 0402 pa
In high-speed logic and circuit design, for some key signals, such as clock, control signals, to add the source end matching resistance, so that the signal will be reflected back from the load end, because the source impedance matching, the reflected sign
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